Thank you for reporting this.
After testing the described scenario I was able to receive the same exception when there is a row with RowHeight > 600. This is why I have logged it in our Feedback portal by creating a public thread on your behalf. You can track its progress, subscribe for status changes, and add your comments on the following link: feedback item.
I have updated your Telerik Points.
To workaround the issue you can create a custom SpreadExportRenderer and override its SetWorksheetRowHeight method:
class MySpreadExportRenderer : SpreadExportRenderer
public override void SetWorksheetRowHeight(int rowIndex, int rowHeight, bool isCustom)
if (rowHeight > SpreadsheetDefaultValues.MaxRowHeight)
rowHeight = (int)SpreadsheetDefaultValues.MaxRowHeight;
base.SetWorksheetRowHeight(rowIndex, rowHeight, isCustom);
I hope this helps. Do not hesitate to contact me if you have other questions.
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